Let's see, where do I begin. I prefer to keep as much range as I possibly can, but I could possibly move that point over to Lightning barrier, but I have to keep that point down there to go up to Polarity shift. As I mentioned earlier, I look at the crit as a way to help Lightning barrage go off, especially since FL is my main nuke. Yes, I do have great regen, but again, I need the points, and who knows, those extra reserves may come in very handy on longer fights. Also, since I don't have anything to help my healing efficiency, in an emergency I can toss extra bubbles and heals.
As far as the backlash, it might be great for trash, but I would imagine that anything boss related is going to be immune, and all the way up to the last boss in EV, the trash isn't that hard. I can't speak to the other Op, or many of the hardmodes just yet.
Oh, and FYI Alacrity = haste. It also effects Lighting barrage and the GCD on anything that isn't an instant cast, so I'm starting to see lighting barrage casts of FL at ~1 sec.